EP0992687B1 - Valve operated discharge control of a household pump - Google Patents
Valve operated discharge control of a household pump Download PDFInfo
- Publication number
- EP0992687B1 EP0992687B1 EP19990119758 EP99119758A EP0992687B1 EP 0992687 B1 EP0992687 B1 EP 0992687B1 EP 19990119758 EP19990119758 EP 19990119758 EP 99119758 A EP99119758 A EP 99119758A EP 0992687 B1 EP0992687 B1 EP 0992687B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- pump
- outlet
- housing
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/06—Mobile combinations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
Definitions
- the invention relates to a liquid pump arrangement, in particular for use in the home and / or garden, according to the preamble of claim 1.
- Constantly increasing water charges and improved environmental awareness are prompting more and more homeowners and / or gardeners to install dual water-use systems and thus also use rainwater as an alternative or in addition to drinking water.
- different fluid pump assemblies are used, such as submersible pumps, garden pumps, fountain pumps or the like.
- Mainly in permanently installed rain systems and domestic water works are used, for example, collected rainwater from a corresponding reservoir through a separate from the drinking water piping system to rainwater consumers such as toilets, washing machines, showers or the like. to promote.
- a fluid control device such as water for attachment to a flow channel connected to a pump
- the control device is essentially formed by a spring-biased check valve and a control valve provided upstream thereof.
- the control valve on a spherical valve body which is provided with a bore and which is arranged relative to a valve body of the check valve, that a positive coupling between the spherical valve body of the control valve and the valve body of the check valve can be realized.
- the flow channel, in which the control device is arranged is delimited by a tubular housing, so that a fluid conveyed by the pump into the flow channel can flow off substantially rectilinearly.
- the water pump is provided with an expansion tank, which is coupled via a control valve to the water supply system.
- the control valve is received in a valve body provided at opposite ends with openings provided for connection to the water pump and to the water supply system.
- a horizontally oriented partition wall is provided, which is provided with a valve opening.
- a further opening is provided in the valve housing, which is provided with a thread and which allows the attachment of the expansion tank.
- the invention has for its object to propose a liquid pump arrangement improved in this respect especially in this respect.
- a liquid pump arrangement has a preferably electromotively drivable liquid pump with at least one pump inlet leading to a pump chamber of the liquid pump, through which liquid can be sucked or introduced, and at least one pump outlet discharging from the pump chamber for dispensing pressurized liquid.
- a check valve unit Downstream of the pump outlet, a check valve unit is arranged, which has a housing and a valve insert which can be removed from the housing.
- the housing has a valve inlet and an angularly arranged valve outlet and is additionally provided with a Ent.öffung for the valve core, which is arranged in extension of the valve inlet.
- the housing is associated with a control member which is provided for a pressure-independent control of a valve body of the valve core.
- the housing is associated with a control member which is provided for a pressure-independent control of a valve body of the valve core.
- the check valve assembly forms an angular connection between a valve inlet and a valve outlet of the housing by aligning the valve outlet at a right angle to the valve inlet.
- This angular connection allows a particularly compact design of the liquid pump assembly and provides a convenient removal option for the valve core.
- the housing of the check valve unit in addition to the valve inlet and the valve outlet has a removal opening for the valve insert is arranged in extension of the valve inlet.
- the valve core is e.g. Removable in extension of the inflow direction.
- the removal opening can be closed by a preferably manually operable closure member, in particular a screw cap, liquid-tight.
- the housing of the check valve unit integrally with the liquid pump assembly, for example, integral with a housing of the liquid pump assembly, it is preferably a separate component.
- the housing has a valve inlet and a valve outlet, which are designed in the manner of connecting pieces of a line connection. This makes it possible to remove the check valve unit as a whole, ie including the housing, from the liquid pump assembly and replace it with a line piece with corresponding similar or identical connection masses.
- the same type of pump may be equipped with a standard pipe section instead of the check valve unit. It is also possible to use the flow-through housing of the check valve unit without inserted valve insert as a flow-through line piece.
- a tool-removable in the assembled state of the check valve unit movably arranged in the housing valve body is provided, which preferably carries at least one interchangeable, rubber-elastic sealing element for cooperation with the valve seat. This also promotes convenient and particularly thorough cleaning.
- FIGS. 1 and 2 are overall views of substantially identical embodiments of a liquid pump assembly 1 is shown, which is particularly intended for home and garden applications and is preferably used as a pump of a domestic waterworks. It has a largely made of stable, impact-resistant plastic housing 2, on the underside recesses for three feet 3 are provided. They define a level of the pump and preferably consist essentially of rubbery soft material, such as a soft thermoplastic. The feet enable a sound-damped stable installation of the pump.
- an electromotively operated by means of a fan 4 air-cooled liquid pump 5 is integrated, the pump impeller 6 rotates about the parallel to the level, normally horizontally oriented pump axis 7 within a pump chamber 8.
- the pump chamber 8 is limited by a substantially dome-shaped chamber housing 9, which in the in Fig. 2 shown embodiment of the same plastic material as the housing, in other embodiments, to increase the pressure resistance of metal, such as stainless steel, may exist.
- a leading into the chamber 8, round in cross-section pump inlet 10 and a leading out of the chamber 8, round in cross-section pump outlet 11 are arranged.
- a horizontal, parallel to the pump axis 7 nozzle 12 with an internal thread for receiving a screw-drain valve 13 is provided in the bottom region of the chamber housing or in a foot attachment connected to the pump chamber ( Fig. 1 ) is a horizontal, parallel to the pump axis 7 nozzle 12 with an internal thread for receiving a screw-drain valve 13 is provided.
- filter nozzle 15 is provided on the suction side of the pump.
- the inlet opening can be closed by a screw cap 17 provided with a seal.
- the diameter of the filling opening 16 is advantageously chosen so large that inserted into the filter neck 15 from above, cone-shaped debris screen 18 can be used with U-bow-shaped handle from above through the filling opening in the filter neck or removed upwards.
- cone-shaped debris screen 18 can be used with U-bow-shaped handle from above through the filling opening in the filter neck or removed upwards.
- filter or sieve 18 is an outwardly directed edge at the upper end of the screen body on an inner shoulder of the filter neck and the inside of the screw 17 presses lightly on the bracket 19, so that the filter element 18 is clamped wobble-free.
- a suction-side inlet opening 20 for sucking of liquid above the upper edge of the pump chamber and above or upstream of the debris screen 18 is arranged.
- the inlet opening 20 is formed by a at the upper end portion of the filter neck 15 horizontally protruding, provided with external thread nozzle 21, the horizontal axis extends at fully screwed filter nozzle substantially parallel to the pump axis 7. Due to the advantageous arrangement of the suction-side filling opening and the likewise suction-side suction inlet opening in front of a dirt filter device 18, the interior of the pump can be reliably prevented from penetrating particles, such as dirt particles, pieces of wood or the like. to be protected. The filter 18 is easily removed after unscrewing the lid 17 for cleaning.
- the pump can be modified in this area by screwing a possibly differently sized filter nozzle in a simple way with respect to the building mass, for example to allow adaptation to specially dimensioned supply lines. It is created as a complete assembly removable or replaceable input filter module.
- the pump 25 On the outlet side or pressure side of the pump 25 further advantageous functional assemblies in the form of interchangeable modules, ie in the form of assemblies that take one or more substantially self-contained functions provided in the pump output 11 downstream pressure line.
- check valve unit 26 In the embodiment shown is located directly or immediately downstream of the pump outlet 11 in connection with FIGS. 4 and 5 in detail explained check valve unit 26 and, this immediately downstream, one in connection with Fig. 6 explained in detail, not belonging to the invention pressure switch unit 27, both of which are advantageously integrated into the housing shape.
- the check valve unit 26 forms an angle of 90 ° including an angle connection between the upwardly discharging pump outlet 11 and the horizontal direction of the laterally dissipating pressure line 25.
- the pressure switch unit 27 Between a lateral outlet nozzle of the check valve unit 26 and the input of a pressure nozzle serving as a handle 28 is the pressure switch unit 27 with a transition piece inserted, wherein the functional elements of the pressure switch are arranged laterally adjacent to the running in the pressure line liquid flow.
- the pressure switch unit is advantageously inserted in the space formed by the liquid flow through the check valve to the pressure line angle in a particularly space-saving manner.
- Fig. 7 Downstream of the pressure switch unit 27 is associated with Fig. 7 closer explained, designed as a rigid or rigid tube discharge pipe 28 which extends to form a handle opening 29 sections, freely above the housing 2 parallel to the pump axis 7.
- the free-floating section is located approximately above the center of mass of the overall pump assembly and can serve as a handle for the pump assembly.
- a rotary joint connection 31 is provided in the course of the outgoing pressure line, which has a lateral output connection 33 oriented radially to the pressure line axis 32 leading through the handle.
- Another, of this separate output terminal 34 is in extension of the carrying handle 30 on the axis 32 and aligned in the example with the suction-side inlet opening 20.
- the check valve unit 26 has a substantially cylindrical plastic housing 40, at its lower end to form a Radial shoulder serving as a valve inlet inlet port 42 are provided with a plurality of circumferential grooves for receiving Rundschnurdichtungen. Serving as a valve outlet outlet nozzle 43 with external thread and circumferential groove for receiving a round cord seal protrudes in the upper region of the housing 40 at an angle of 90 ° to the inlet nozzle from the housing 40. Above the outlet nozzle, a further housing opening 41 with an internally threaded portion for receiving a screw cap 44 is provided on the housing which is open at the top. In the housing section between inlet nozzle and outlet nozzle is an in Fig.
- magnetic field-sensitive sensor 47 for example, a Hall sensor is formed.
- a fully removable valve core 49 is arranged within the housing 40.
- This comprises a valve seat member 50, which has a cylindrical outer contour adapted to the cylindrical inner contour of the upper region of the valve housing with two axially offset circumferential grooves, of which the upper for receiving a sealing against the housing inner wall serving Rundschnurdichtung 51 and the lower for insertion of radially insertable through the housing wall Locking pins 52 is used.
- the valve seat member 50 is in the installed state on an inwardly directed abutment shoulder of the housing wall above the transverse opening 45 and is secured by the pins 52 against falling out.
- An inwardly directed shoulder 54 provided at the lower end of a cylindrical guide opening 53 of the valve seat element serves as a valve seat of the check valve.
- a cooperating with the valve seat, serving as shut-off spring-loaded, self-return valve body 55 has an internally hollow, cylindrical shaft 56 which has on the valve seat facing side below a web 57 a receiving groove for cooperating with the valve seat 54 elastic round cord seal 58.
- a radial cylindrical receptacle for a permanent magnet 48 is formed on the not belonging to the invention magnetic field sensor 47 side facing, which is arranged with the valve closed below the magnetic field sensor and outside its effective range.
- Between the circumferential collar 57 of the valve body and the cylindrical guide opening 53 of the valve seat member remains a small gap, which can serve as leakage current channel with slight lifting of the sealing ring 58 from the valve seat.
- a conical tip 59 of the valve body protrudes when the valve is closed ( 4 and 5
- an upwardly conically widening plate is provided which serves, inter alia, the support of a conically wound compression spring whose opposite, wider end is at the concave inwardly curved head portion 61 of the screw 44 is supported.
- the screw cap provided with an external thread and a grip web 62 arranged inside the front-side concave recess has on its inside an axially extending guide element 63 with a cross-shaped cross-section which is substantially free of play into the cylindrical interior of the valve body is insertable and the axially sliding guide of the valve body is used.
- multi-part control member 46 has an inside of the valve housing below the opening of the valve seat member anordenbares, souströmbares ball member 65 to which a running around the axis of rotation of the control member, in section V-shaped cam contour 66 is provided with the conical tip 59 of the valve body for axial displacement of the valve body cooperates.
- the cam contour is designed so that in the in the Figures 2 .
- valve insert 49 can be removed as a possibly complete assembly after unscrewing the cover 44, with the switch cover 44 and the guided and carried by this valve body normally remain connected and the valve seat member may optionally remain in the housing 40.
- Particularly advantageous is the angular design of the check valve device, which allows a recess of the valve core in continuation of the direction of the inflowing fluid.
- valve insert can optionally be removed when the check valve device is installed, without the rest of the structure of the pump arrangement being influenced thereby, in particular even without the need for removing further components.
- control member 46 can be removed because of its multi-part construction.
- the illustrated embodiment of the check valve unit is simultaneously formed as a drain valve.
- the valve possibly in the intake and / or in the pump chamber located air initially be removed before the pure liquid feed operation is received. Due to the compressibility of air, functional limitations can occur without this possibility at the beginning of pump operation.
- the control member is out of engagement with the valve body, so that it can only be moved by sufficient inlet-side overpressure in the open position.
- valve unit also forms a drain valve.
- the illustrated embodiment of the check valve unit also acts as not belonging to the invention flow sensor, which provides a simple memoriverarbeitbares by a pump control electrical flow signal.
- the displacement of the valve body 55 is detected by the magnetic field sensor 47, as soon as the permanent magnet 48 is moved into the effective range of the sensor 47.
- the embodiment shown is designed so that at low displacement of Valve body by the effect of a low leakage current of the permanent magnet from the sensor is not yet detected. Only with a stronger displacement of the valve body, the size of which depends on the current fluid flow, is the permanent magnet in the detection range of the magnetic field sensor and supplies a flow rate signal dependent on the amount of fluid per unit time.
- the described embodiment of the check valve unit thus combines several functions in that it also provides a function as a drain valve and as a vent valve in addition to the function as a check valve. In other embodiments, these functions can also be provided by separate components or modules and / or elsewhere in the area of the discharging pressure line.
- a transition piece 70 is provided, which is designed in the manner of a connecting pipe sleeve and at both axial ends 71, 72 provided with female threads receiving openings for screwing pipe sections or the like. having.
- the functional elements of the pressure switch are accommodated laterally next to the liquid flow running between the ends 71, 72 on or in a pressure switch housing 73 formed integrally with the transition nozzle 70.
- a small cross-section radial channel 74 connects the interior of the nozzle 70 with the interior of the housing 73 and is liquid-tightly sealed by a flexible membrane 75.
- an axially movably mounted within the housing 73 switch body 76 is supported, which is pressed by means of a coil compression spring to the membrane.
- This is based on a set screw 77, which serves to adjust the spring pressure on the body 76 and is guided within a housing 73 outside strigden screw cap 78.
- the switch body 76 acts via a hinged switch lever 79, which is guided through a recess of the housing wall to the outside, on an outside mounted on the housing electrical switch 80, which emits a dependent on the fluid pressure within the nozzle 70, further processed by a pump control pressure signal.
- a pressure switch unit can also be firmly connected to the pump housing and structurally integrated into this. If a pressure switch unit is not or not at the example in Fig. 2 shown point is required, the pressure switch module can be replaced by a simple connecting pipe sleeve.
- the arranged in the exit region rotary joint connection 31 has a sleeve with a lateral or radial port 33 which is mounted to the pressure line axis 32 stepless and infinitely rotatable and is sealed with round cord seals 85.
- a slot-shaped wall openings 86 in the pressure pipe water from the emerging in the axial direction of the pressure line laterally to the radial outlet 33 of the rotary joint 31.
- Both the lateral outlet 33 of the rotary joint and the front outlet 34 of the pressure line lying in the direction of the axis 32 can be shut off, preferably separately, for example by screwing on a screw cap.
- cock pieces can be screwed with quick coupling nipples.
- the swivel joint offers the possibility of connecting a second consumer to the pump without a separate branch piece.
- the infinite and continuous rotation of the rotary joint the second terminal 33 can be rotated in different, optimal for each application directions.
- a U-shaped housing recess 87 is provided in the example shown, in which the lateral connection 33 can be rotated. This is preferably dimensioned so large that they can record, for example, a screwed onto the connection fitting with water stop.
- An advantageous use of a pump arrangement with at least two separate pump outlet connections can also be seen in that an output, in particular the output lying in the longitudinal axis 34, eg a pneumatic pressure accumulator can be connected, in particular for the operation of the pump as a domestic waterworks or in a comparable mode may be advantageous to effect, for example, a buffering.
- an output in particular the output lying in the longitudinal axis 34, eg a pneumatic pressure accumulator can be connected, in particular for the operation of the pump as a domestic waterworks or in a comparable mode may be advantageous to effect, for example, a buffering.
- each with separately functional and individually or in groups installable or expandable units offers a particular advantage that instead of units and simple line elements can be used.
- each component not required to be replaced by a simple conduit element with identical mounting dimensions For example, the in Fig. 2 be replaced by the check valve unit 26 by a 90 ° elbow and the pressure switch unit 27 is replaced by a connecting pipe sleeve. If only one pump outlet is required, for example, the discharge nozzle 28 can also be designed without a rotary joint connection 31.
- One connection may be permanently connected to a domestic water supply network and the other may be connected to a drainage valve via which the mains network can be emptied, eg for maintenance, without disconnecting the pump and without emptying the pump itself, which is normally the case requires a manual bleeding of the pump before recommissioning.
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Description
Die Erfindung betrifft eine Flüssigkeitspumpenanordnung, insbesondere für die Verwendung in Haus und/oder Garten, gemäss dem Oberbegriff von Anspruch 1.The invention relates to a liquid pump arrangement, in particular for use in the home and / or garden, according to the preamble of
Ständig steigende Wassergebühren und ein verbessertes Umweltbewusstsein veranlassen immer mehr Haus- und/oder Gartenbesitzer, duale Wassernutzungssysteme zu installieren und damit alternativ oder zusätzlich zu Trinkwasser auch Regenwasser zu nutzen. Hierbei können zur Förderung des Wassers von Sammelstellen wie Teichen, Zisternen o.dgl. zu Verbrauchern unterschiedliche Flüssigkeitspumpenanordnungen verwendet werden, beispielsweise Tauchpumpen, Gartenpumpen, Springbrunnenpumpen o.dgl. Vor allem in fest installierten Regennutzungssystemen kommen auch Hauswasserwerke zum Einsatz, um beispielsweise gesammeltes Regenwasser von einem entsprechenden Reservoir durch ein vom Trinkwasserleitungssystem gesondertes Rohrsystem zu Regenwasser-Verbrauchern wie Toiletten, Waschmaschinen, Duschen o.dgl. zu fördern.Constantly increasing water charges and improved environmental awareness are prompting more and more homeowners and / or gardeners to install dual water-use systems and thus also use rainwater as an alternative or in addition to drinking water. Here, to promote the water of collection points such as ponds, cisterns or the like. to consumers different fluid pump assemblies are used, such as submersible pumps, garden pumps, fountain pumps or the like. Mainly in permanently installed rain systems and domestic water works are used, for example, collected rainwater from a corresponding reservoir through a separate from the drinking water piping system to rainwater consumers such as toilets, washing machines, showers or the like. to promote.
Aus der
Aus der
Wichtige Kriterien für die Auswahl einer für den jeweiligen Einsatz geeigneten Pumpe ist neben Wirtschaftlichkeit, Langlebigkeit, Korrosionsbeständigkeit und Laufruhe vor allem die Wartungsfreundlichkeit, um beispielsweise Reinigungsarbeiten zur Beseitigung von Verunreinigungen leicht durchführen zu können.Important criteria for the selection of a suitable pump for the respective application is in addition to economy, longevity, corrosion resistance and smoothness above all the ease of maintenance For example, to carry out cleaning work to eliminate impurities easily.
Der Erfindung liegt die Aufgabe zugrunde, eine vor allem in dieser Hinsicht verbesserte Flüssigkeitspumpenanordnung vorzuschlagen.The invention has for its object to propose a liquid pump arrangement improved in this respect especially in this respect.
Diese Aufgabe wird gelöst durch eine Flüssigkeitspumpenanordnung mit den Merkmalen von Anspruch 1. Vorteilhafte Weiterbildungen sind in den abhängigen Ansprüchen angegeben, deren Wortlaut durch Bezugnahme zum Inhalt der Beschreibung gemacht wird.This object is achieved by a liquid pump arrangement having the features of
Eine erfindungsgemäße Flüssigkeitspumpenanordnung hat eine vorzugsweise elektromotorisch antreibbare Flüssigkeitspumpe mit mindestens einem zu einer Pumpenkammer der Flüssigkeitspumpe führenden Pumpeneingang, durch den Flüssigkeit ansaugbar oder einleitbar ist, und mindestens einem von der Pumpenkammer abführenden Pumpenausgang zur Abgabe von unter Druck stehender Flüssigkeit. Stromabwärts des Pumpenausgangs ist eine Rückschlagventileinheit angeordnet, die ein Gehäuse und einen aus dem Gehäuse entnehmbaren Ventileinsatz hat. Das Gehäuse weist einen Ventileintritt und einen winklig dazu angeordneten Ventilaustritt auf und ist zusätzlich mit einer Entnahmeöffung für den Ventileinsatz versehen, die in Verlängerung des Ventileintritts angeordnet ist. Dem Gehäuse ist ein Steuerorgan zugeordnet, das für eine druckunabhängige Ansteuerung eines Ventilkörpers des Ventileinsatzes vorgesehen ist. Dem Gehäuse ist ein Steuerorgan zugeordnet, das für eine druckunabhängige Ansteuerung eines Ventilkörpers des Ventileinsatzes vorgesehen ist. Dadurch wird die Möglichkeit geschaffen, ggf. alle zu wartenden, insbesondere zu reinigenden und/oder einer Störung durch Verkalkung oder Verstopfung ausgesetzten Komponenten zu entnehmen und diese außerhalb der Flüssigkeitspumpenanordnung zu reinigen oder ggf. einzeln oder gruppenweise auszutauschen. Besonders vorteilhaft ist es, dass die Entnahme möglich ist, ohne dass die Leitungsführung zwischen Pumpenausgang und einer nachgeschalteten Druckleitung aufgelöst werden muss, da das durchströmbare Gehäuse mit der Flüssigkeitspumpenanordnung verbunden bleiben kann.A liquid pump arrangement according to the invention has a preferably electromotively drivable liquid pump with at least one pump inlet leading to a pump chamber of the liquid pump, through which liquid can be sucked or introduced, and at least one pump outlet discharging from the pump chamber for dispensing pressurized liquid. Downstream of the pump outlet, a check valve unit is arranged, which has a housing and a valve insert which can be removed from the housing. The housing has a valve inlet and an angularly arranged valve outlet and is additionally provided with a Entnahmöffung for the valve core, which is arranged in extension of the valve inlet. The housing is associated with a control member which is provided for a pressure-independent control of a valve body of the valve core. The housing is associated with a control member which is provided for a pressure-independent control of a valve body of the valve core. This creates the possibility, if necessary, of removing all the components that are to be serviced, in particular those that are to be cleaned and / or exposed to a fault due to calcification or blockage, and to clean them outside the liquid pump arrangement or if necessary to exchange them individually or in groups. It is particularly advantageous that the removal is possible without the wiring between the pump outlet and a downstream pressure line must be resolved because the durchströmbare housing can remain connected to the liquid pump assembly.
Die Rückschlagventileinheit bildet eine Winkelverbindung zwischen einem Ventileintritt und einem Ventilaustritt des Gehäuses, indem der Ventilaustritt in einem rechten Winkel zum Ventileintritt ausgerichtet ist. Diese Winkelverbindung ermöglicht einen besonders kompakten Aufbau der Flüssigkeitspumpenanordnung und schafft eine bequeme Entnahmemöglichkeit für den Ventileinsatz. Hierzu hat das Gehäuse der Rückschlagventileinheit zusätzlich zum Ventileintritt und dem Ventilaustritt eine Entnahmeöffnung für den Ventileinsatz die in Verlängerung des Ventileintritts angeordnet ist. Dadurch wird der Ventileinsatz z.B. in Verlängerung der Zuflussrichtung entnehmbar. Die Entnahmeöffnung kann durch ein vorzugsweise manuell betätigbares Verschlussglied, insbesondere einen Schraubdeckel, flüssigkeitsdicht verschließbar sein.The check valve assembly forms an angular connection between a valve inlet and a valve outlet of the housing by aligning the valve outlet at a right angle to the valve inlet. This angular connection allows a particularly compact design of the liquid pump assembly and provides a convenient removal option for the valve core. For this purpose, the housing of the check valve unit in addition to the valve inlet and the valve outlet has a removal opening for the valve insert is arranged in extension of the valve inlet. As a result, the valve core is e.g. Removable in extension of the inflow direction. The removal opening can be closed by a preferably manually operable closure member, in particular a screw cap, liquid-tight.
Bei einer Ausführungsform ist die Entnahme des Ventileinsatzes mit wenigen Handgriffen ohne Zuhilfenahme von Werkzeugen, also werkzeuglos möglich, wodurch dieser Eingriff schnell und einfach bei Bedarf durchführbar ist.In one embodiment, the removal of the valve insert in a few steps without the aid of tools, so without tools possible, making this intervention quickly and easily if necessary feasible.
Obwohl es möglich ist, das Gehäuse der Rückschlagventileinheit integral mit der Flüssigkeitspumpenanordnung, beispielsweise einstückig mit einem Gehäuse der Flüssigkeitspumpenanordnung auszubilden, handelt es sich vorzugsweise um ein gesondertes Bauteil. Bei einer bevorzugten Ausführung hat das Gehäuse einen Ventileintritt und einen Ventilaustritt, die nach Art von Anschlussstutzen einer Leitungsverbindung ausgebildet sind. Dadurch wird es möglich, die Rückschlagventileinheit als Ganzes, also inklusive des Gehäuses, von der Flüssigkeitspumpenanordnung abzunehmen und durch ein Leitungsstück mit entsprechenden ähnlichen oder identischen Anschlussmassen zu ersetzen. Für Anwendungsfälle, in denen ein Rückschlagventil nicht erforderlich ist, kann somit derselbe Pumpentyp auch mit einem Standard-Leitungsstück anstelle der Rückschlagventileinheit ausgestattet sein. Es ist auch möglich, das durchströmbare Gehäuse der Rückschlagventileinheit ohne eingesetzten Ventileinsatz als durchströmbares Leitungsstück zu nutzen.Although it is possible to form the housing of the check valve unit integrally with the liquid pump assembly, for example, integral with a housing of the liquid pump assembly, it is preferably a separate component. In a preferred embodiment, the housing has a valve inlet and a valve outlet, which are designed in the manner of connecting pieces of a line connection. This makes it possible to remove the check valve unit as a whole, ie including the housing, from the liquid pump assembly and replace it with a line piece with corresponding similar or identical connection masses. Thus, for applications where a check valve is not required, the same type of pump may be equipped with a standard pipe section instead of the check valve unit. It is also possible to use the flow-through housing of the check valve unit without inserted valve insert as a flow-through line piece.
Vorzugsweise ist ein insbesondere werkzeuglos entnehmbarer, im zusammengebauten Zustand der Rückschlagventileinheit im Gehäuse beweglich angeordneter Ventilkörper vorgesehen, der vorzugsweise mindestens ein auswechselbares, gummielastisches Dichtelement zum Zusammenwirken mit dem Ventilsitz trägt. Auch hierdurch wird bequeme und eine besonders gründliche Reinigung gefördert.Preferably, in particular a tool-removable, in the assembled state of the check valve unit movably arranged in the housing valve body is provided, which preferably carries at least one interchangeable, rubber-elastic sealing element for cooperation with the valve seat. This also promotes convenient and particularly thorough cleaning.
Diese und weitere Merkmale gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein können.These and other features are apparent from the claims, the description and the drawings, wherein the individual features can be implemented individually or in each case in the form of sub-combinations in an embodiment of the invention and in other fields.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher erläutert. In den Zeichnungen zeigen:
- Fig. 1
- eine schrägperspektivische Ansicht einer Ausführungsform einer erfindungsgemäßen Flüssigkeitspumpe,
- Fig. 2
- einen teilweisen vertikalen Längsschnitt durch eine andere Ausführungsform einer Flüssigkeitspumpe ähnlich
Fig. 1 , - Fig. 3
- einen Schnitt durch einen nicht zur Erfindung gehörenden, entnehmbaren Filterstutzen der Ausführungsform gemäß
Fig. 2 , - Fig. 4
- einen Längsschnitt durch eine entnehmbare Rückschlagventileinheit der Ausführungsform gemäss
Fig. 2 , - Fig. 5
- einen Längsschnitt durch die in
Fig. 4 gezeigte Rückschlagventileinheit in einer um 90 Grad versetzten Schnittebene, - Fig. 6
- einen Schnitt durch eine nicht zur Erfindung gehörende, entnehmbare Druckschaltereinheit der Ausführungsform nach
Fig. 2 , - Fig. 7
- einen Schnitt durch einen als Handgriff dienenden Druckstutzen der Ausführungsform nach
Fig. 2 und - Fig. 8
- einen Schnitt durch das nicht zur Erfindung gehörende Ablassventil der in
Fig. 2 gezeigten Ausführungsform.
- Fig. 1
- an oblique perspective view of an embodiment of a liquid pump according to the invention,
- Fig. 2
- a partial vertical longitudinal section through another embodiment of a liquid pump similar
Fig. 1 . - Fig. 3
- a section through a not belonging to the invention, removable filter neck of the embodiment according to
Fig. 2 . - Fig. 4
- a longitudinal section through a removable check valve unit of the embodiment according to
Fig. 2 . - Fig. 5
- a longitudinal section through the in
Fig. 4 shown check valve unit in a 90 degree offset cutting plane, - Fig. 6
- a section through a not belonging to the invention, removable pressure switch unit of the embodiment according to
Fig. 2 . - Fig. 7
- a section through a serving as a handle pressure port of the embodiment according to
Fig. 2 and - Fig. 8
- a section through the not belonging to the invention drain valve of in
Fig. 2 shown embodiment.
In den
Auf der Saugseite der Pumpe ist ein in Zusammenhang mit
Auf der Auslassseite bzw. Druckseite der Pumpe sind in der dem Pumpenausgang 11 nachgeschalteten Druckleitung 25 weitere vorteilhafte Funktionsbaugruppen in Form auswechselbarer Module, d.h. in Form von Baugruppen, die eine oder mehrere im wesentlichen in sich geschlossene Funktionen übernehmen, vorgesehen. Bei der gezeigten Ausführungsform befindet sich direkt bzw. unmittelbar stromabwärts des Pumpenausgangs 11 eine im Zusammenhang mit
Stromabwärts der Druckschaltereinheit 27 ist ein im Zusammenhang mit
Die besonders in den
Innerhalb des Gehäuses 40 ist ein vollständig entnehmbarer Ventileinsatz 49 angeordnet. Dieser umfasst ein Ventilsitzelement 50, das eine der zylindrischen Innenkontur des Oberbereichs des Ventilgehäuses angepasste zylindrische Aussenkontur mit zwei axial versetzten Umfangsnuten hat, wovon die obere zur Aufnahme einer der Abdichtung gegen die Gehäuseinnenwand dienenden Rundschnurdichtung 51 und die untere zum Einführen von radial durch die Gehäusewand einführbaren Sicherungsstiften 52 dient. Das Ventilsitzelement 50 liegt in eingebautem Zustand auf einer nach innen gerichteten Anlageschulter der Gehäusewand oberhalb der Queröffnung 45 auf und wird durch die Stifte 52 gegen Herausfallen gesichert. Eine am unteren Ende einer zylindrischen Führungsöffnung 53 des Ventilsitzelementes vorgesehene, nach innen gerichtete Schulter 54 dient als Ventilsitz des Rückschlagventils.Within the
Ein mit dem Ventilsitz zusammenwirkender, als Absperrelement dienender federbelasteter, selbstrückstellender Ventilkörper 55 hat einen innen hohlen, zylindrischen Schaft 56, der auf der ventilsitzzugewandten Seite unterhalb eines Steges 57 einer Aufnahmenut für eine mit dem Ventilsitz 54 zusammenwirkende elastische Rundschnurdichtung 58 hat. Am Schaft 56 ist auf der dem nicht zur Erfindung gehörenden Magnetfeldsensor 47 zugewandten Seite eine radiale, zylindrische Aufnahme für einen Dauermagneten 48 ausgebildet, der bei geschlossenem Ventil unterhalb des Magnetfeldsensors und ausserhalb von dessen Wirkbereich angeordnet ist. Zwischen dem umlaufenden Kragen 57 des Ventilkörpers und der zylindrischen Führungsöffnung 53 des Ventilsitzelementes verbleibt ein geringer Spalt, der bei geringfügiger Abhebung des Dichtungsringes 58 vom Ventilsitz als Leckstromkanal dienen kann. Dieser nur für eine Leitung geringer Leckströme vorgesehene Ringkanal ist nur über einen kurzen Verschiebeweg des Ventilkörpers von der Absperrfunktion gegeben. Sobald der umlaufende Kragen in den Bereich oberhalb des Ventilsitzelementes 50 abgehoben ist, steht ein deutlich grösserer Strömungsquerschnitt zwischen Einlass und Auslass des Ventils zur Verfügung.A cooperating with the valve seat, serving as shut-off spring-loaded, self-
Eine konische Spitze 59 des Ventilkörpers ragt bei geschlossenem Ventil (
Das in die Queröffnung 45 einsetzbare, mehrteilige Steuerorgan 46 hat ein im Inneren des Ventilgehäuses unterhalb der Öffnung des Ventilsitzelementes anordenbares, durchströmbares Kugelelement 65, an dem eine um die Drehachse des Steuerorgans herumverlaufende, im Schnitt V-förmige Nockenkontur 66 vorgesehen ist, die mit der konischen Spitze 59 des Ventilkörpers zur axialen Verschiebung des Ventilkörpers zusammenwirkt. Dabei ist die Nockenkontur so ausgebildet, dass in der in den
Der Ventileinsatz 49 ist als ggf. vollständige Baugruppe nach Abschrauben des Deckels 44 entnehmbar, wobei Schaltdeckel 44 und der von diesem geführte und getragene Ventilkörper normalerweise zusammenhängend bleiben und das Ventilsitzelement ggf. auch im Gehäuse 40 verbleiben kann. Besonders vorteilhaft wirkt sich die Winkelausführung der Rückschlagventileinrichtung aus, die eine Entnehmung des Ventileinsatzes in Fortsetzung der Richtung des zuströmenden Fluides ermöglicht.The
Dadurch kann der Ventileinsatz ggf. bei eingebauter Rückschlagventileinrichtung entnommen werden, ohne dass der übrige Aufbau der Pumpenanordnung davon beeinflusst ist, insbesondere auch ohne dass weitere Komponenten entfernt werden müssen. Auch das Steuerorgan 46 ist aufgrund seines mehrteiligen Aufbaus entnehmbar.As a result, the valve insert can optionally be removed when the check valve device is installed, without the rest of the structure of the pump arrangement being influenced thereby, in particular even without the need for removing further components. Also, the
Dank des Steuerorgans 46 ist die gezeigte Ausführungsform der Rückschlagventileinheit gleichzeitig als Entleerungsventil ausgebildet. So kann beispielsweise am Beginn des Pumpenbetriebes durch Öffnung des Ventils ggf. im Ansaugbereich und/oder in der Pumpenkammer befindliche Luft zunächst abgefördert werden, bevor der reine Flüssigkeitsförderbetrieb aufgenommen wird. Aufgrund der Komprimierbarkeit von Luft können sich ohne diese Möglichkeit zu Beginn des Pumpenbetriebes Funktionebeeinträchtigungen ergeben. Im Normalbetrieb der Pumpe ist dagegen das Steuerorgan ausser Eingriff mit dem Ventilkörper, so dass dieser nur durch ausreichenden einlassseitigen Überdruck in Offenstellung bewegbar ist.Thanks to the
Weiterhin ist es durch manuelle Öffnung des Ventils mittels Steuerorgan 46 möglich, bei abgeschalteter Pumpe ein angeschlossenes Leitungssystem durch die Rückschlagventileinrichtung hindurch beispielsweise über das geöffnete Ablassventil oder durch den Ansaugstutzen zu entleeren, so dass die Ventileinheit auch ein Entleerungsventil bildet.Furthermore, it is possible by manual opening of the valve by means of
Die gezeigte Ausführungsform der Rückschlagventileinheit wirkt ausserdem als nicht zur Erfindung gehörender Durchflusssensor, der ein durch eine Pumpensteuerung einfach weiterverarbeitbares elektrisches Durchflusssignal liefert. Hierzu wird die Verschiebung des Ventilkörpers 55 durch den Magnetfeldsensor 47 detektiert, sobald der Dauermagnet 48 in den Wirkbereich des Sensors 47 verschoben ist. Die gezeigte Ausführungsform ist dabei so ausgelegt, dass bei geringer Verschiebung des Ventilkörpers durch die Wirkung eines geringen Leckstromes der Dauermagnet vom Sensor noch nicht detektiert wird. Erst bei stärkerer Verschiebung des Ventilkörpers, deren Mass von dem aktuellen Flüssigkeitsdurchfluss abhängt, befindet sich der Dauermagnet im Detektionsbereich des Magnetfeldsensors und liefert ein von der pro Zeiteinheit durchgelassene Flüssigkeitsmenge abhängiges Durchflusssignal. Die vorteilhafte Ausbildung, bei der geringe Leckströme kein Durchflusssignal erzeugen, ist insbesondere dann von Bedeutung, wenn die Pumpe nach Massgabe des Sensorsignals des Durchflusssensors gesteuert wird, insbesondere um die Pumpe ein- oder auszuschalten. Diese Schaltvorgänge werden entsprechend nicht schon durch geringe Leckströme bewirkt, sondern erst durch substantielle Entnahmen auf der Druckseite.The illustrated embodiment of the check valve unit also acts as not belonging to the invention flow sensor, which provides a simple weiterverarbeitbares by a pump control electrical flow signal. For this purpose, the displacement of the
Die beschriebene Ausführungsform der Rückschlagventileinheit vereinigt somit mehrere Funktionen in sich, indem sie neben der Funktion als Rückschlagventil auch eine Funktion als Entleerungsventil und als Entlüftungsventil bereitstellt. Diese Funktionen können bei anderen Ausführungsformen auch durch gesonderte Bauelemente bzw. Module und/oder an anderer Stelle im Bereich der abführenden Druckleitung vorgesehen sein.The described embodiment of the check valve unit thus combines several functions in that it also provides a function as a drain valve and as a vent valve in addition to the function as a check valve. In other embodiments, these functions can also be provided by separate components or modules and / or elsewhere in the area of the discharging pressure line.
Bei der besonders in
Der der Druckschaltereinheit 27 nachgeschaltete, in
Der im Ausgangsbereich angeordnete Drehgelenkanschluss 31 hat eine Hülse mit einem seitlichen bzw. radialen Anschluss 33, der um die Druckleitungsachse 32 stufenlos und unbegrenzt drehbar gelagert ist und dabei mit Rundschnurdichtungen 85 abgedichtet ist. Über schlitzförmige Wandöffnungen 86 im Druckleitungsrohr kann Wasser aus der in Axialrichtung verlaufenden Druckleitung seitlich zum Radialausgang 33 des Drehgelenks 31 austreten. Sowohl der seitliche Ausgang 33 des Drehgelenks als auch der in Richtung der in Achse 32 liegende Vorderausgang 34 der Druckleitung sind, vorzugsweise separat, absperrbar, beispielsweise durch Aufschrauben einer Schraubkappe. Auf beide Anschlüsse können auch übliche Anschlussstücke, insbesondere Hahnstücke mit Schnellkupplungsnippeln aufgeschraubt werden. Das Drehgelenk bietet zum einen die Möglichkeit, einen zweiten Verbraucher an die Pumpe ohne separates Verzweigungsstück anzuschliessen. Ausserdem kann durch die unbegrenzte und stufenlose Drehbarkeit des Drehgelenkes der zweite Anschluss 33 in verschiedene, für den jeweiligen Einsatz optimale Richtungen gedreht werden. Für eine Position des Drehgelenks mit nicht genutztem zweiten Ausgang 33 ist im gezeigten Beispiel eine U-förmige Gehäuseaussparung 87 vorgesehen, in die der seitliche Anschluss 33 gedreht werden kann. Diese ist vorzugsweise so gross bemessen, dass sie beispielsweise auch ein auf den Anschluss aufgeschraubtes Anschlussstück mit Wasserstop aufnehmen kann.The arranged in the exit region rotary
Bei der gezeigten Ausführungsform ist weiterhin vorteilhaft die entgegengesetzte, achsparallele Ausrichtung des Sauganschlusses 20 am Pumpeneingang und des axialen Ausgangs 34 der wegführenden Druckleitung am Pumpenausgang, die es ermöglichen, die Flüssigkeitspumpe 1 in einen ansonsten geradlinigen Leitungsverlauf einzubauen.In the embodiment shown is also advantageous opposite, axially parallel alignment of the
Eine vorteilhafte Verwendung einer Pumpenanordnung mit mindestens zwei separaten Pumpenausgangsanschlüssen kann auch darin gesehen werden, dass an einen Ausgang, insbesondere den in Längsachse liegenden Ausgang 34, ein z.B. pneumatischer Druckspeicher anschliessbar ist, der insbesondere für die Betriebsweise der Pumpe als Hauswasserwerk oder in einer vergleichbaren Betriebsart vorteilhaft sein kann, um beispielsweise eine Pufferung zu bewirken.An advantageous use of a pump arrangement with at least two separate pump outlet connections can also be seen in that an output, in particular the output lying in the
Der modulare Aufbau mit jeweils separat funktionsfähigen und einzeln oder in Gruppen einbaubaren oder ausbaubaren Baueinheiten bietet als besonderen Vorteil, dass anstelle von Baueinheiten auch einfache Leitungselemente eingesetzt werden können. So kann beispielsweise für Anwendungen, bei denen ein Rückschlagventil und/oder ein Druckschalter nicht benötigt werden, die jeweils nicht benötigte Komponente durch ein einfaches Leitungselement mit identischen Einbaumassen ersetzt werden. So kann beispielsweise die in
Claims (5)
- Fluid pump arrangement, in particular for use in the house and/or garden, with a fluid pump (5) with at least one pump inlet (10) leading to a pump chamber (8) of the fluid pump and at least one pump outlet (11) leading away from the pump chamber, wherein downstream of the pump outlet (11) a non-return valve unit (26) is arranged with a housing (40), which has a valve inlet (42) and a valve outlet (43) and assigned to which are a valve insert (49) with a valve body (55), which insert can be removed from the housing, as well as a control organ (46), which is provided for a pressure-independent activation of the valve body, characterised by that the valve outlet (43) is aligned perpendicular to the valve inlet (42), and that the housing (40), in addition to the valve inlet (42) and the valve outlet (43), has a withdrawal opening (41) for the valve insert (49), which is arranged in extension of the valve inlet (42) and wherein a pressure line, which is part of a housing of the pump arrangement, connects to the valve outlet (43).
- Fluid pump arrangement according to claim 1, characterised by that the valve inlet (42) and the valve outlet (43) are formed in the manner of connection pieces of a line connection.
- Fluid pump arrangement according to claim 1 or 2, characterised by that the non-return valve unit (26) is removable as a whole from the fluid pump arrangement and can be replaced preferably by a line section with corresponding connection dimensions.
- Fluid pump arrangement according to one of claims 1 to 3, characterised by that the valve inlet is formed as plug connection piece insertable into the pump outlet (11) in a sealed manner and/or that the valve outlet (43) is formed as threaded connection piece.
- Fluid pump arrangement according to one of the preceding claims, characterised by that the withdrawal opening (41) has a manually operable closure organ for the withdrawal opening (41), in particular a screw lid (44) that can be unscrewed or screwed in in a sealed manner.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19846047 | 1998-10-07 | ||
DE19846047 | 1998-10-07 | ||
DE19923357A DE19923357A1 (en) | 1998-10-07 | 1999-05-21 | Liquid pump arrangement, in particular for use in the home and / or garden |
DE19923357 | 1999-05-21 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0992687A2 EP0992687A2 (en) | 2000-04-12 |
EP0992687A3 EP0992687A3 (en) | 2001-01-31 |
EP0992687B1 true EP0992687B1 (en) | 2013-05-29 |
Family
ID=26049333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19990119758 Expired - Lifetime EP0992687B1 (en) | 1998-10-07 | 1999-10-06 | Valve operated discharge control of a household pump |
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Country | Link |
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EP (1) | EP0992687B1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20206082U1 (en) * | 2002-04-18 | 2002-09-26 | Wisy Ag Haustechniksysteme Fil | Water supply system |
EP3156661B1 (en) * | 2015-10-15 | 2023-12-06 | Grundfos Holding A/S | Domestic water system or pump with a check valve |
EP3156660B1 (en) | 2015-10-15 | 2022-04-13 | Grundfos Holding A/S | Domestic water system with centrifugal pump and membrane pressure tank |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3876336A (en) * | 1970-04-15 | 1975-04-08 | Jacuzzi Bros Inc | Tankless automatic water system |
US3867071A (en) * | 1972-09-22 | 1975-02-18 | Ezra D Hartley | Pumping system with air vent |
US4431433A (en) * | 1982-09-14 | 1984-02-14 | Gerlach Charles R | Single stage liquid motor and pump |
JPS6018675A (en) * | 1984-06-12 | 1985-01-30 | Matsushita Electric Ind Co Ltd | Check valve of pump |
US5062452A (en) * | 1990-11-21 | 1991-11-05 | Harrisburg, Inc. | Valve member and method of making such a member |
IT1268937B1 (en) * | 1994-01-14 | 1997-03-18 | Co Ge S R L | DEVICE FOR THE CONTROL OF A WATER DISTRIBUTION SYSTEM |
DE19629137A1 (en) * | 1996-07-19 | 1998-01-22 | Gardena Kress & Kastner Gmbh | Control device for a fluid, such as water |
-
1999
- 1999-10-06 EP EP19990119758 patent/EP0992687B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
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EP0992687A3 (en) | 2001-01-31 |
EP0992687A2 (en) | 2000-04-12 |
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